I have the Xero Umara Z-Trails. Bought them for bikepacking as I needed something I could swap into quickly without removing my socks (no divided toe-strap), provide enough tread for water crossings and day hikes and some stability to allow cycling short distances in them.
I ended up hiking Asahidake and Mt Oakan in Hokkaido in them, which are rougher trails (mud, rocks, tree roots, etc) than 90% of what I've done around Victoria have been. Certainly without a divided toe-strap I did find my feet slip forward in them once muddly/wet, especially on the downhills, so there's essentially a bit of winching your feet into them to provide more stability when required. And also more prone to catching the front of the sandal if you're not careful about lifting your feet high enough over obstacles, so more at risk of stubbing a toe or tripping by carelessness.
But I would absolutely hike nearly anything in them, knowing their limitations (maybe not snow.. hypothermia!). They are not my Salomon trail runners, but they fit my intended purpose perfectly and I take them away every hiking trip to use as camp sandals.
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